PURPOSE: To demonstrate the mechanical advantage of a pulley.

DESCRIPTION: A pulley is attached to a hook about ten feet above the floor. The subject is able to raise his or her body off the floor by exerting a force equal to one-half of his or her weight. Use gloves to protect hands from rope burn.

SUGGESTIONS: DANGER: Noose must be looped below arms. Standing on rope loop can cause you to flip, leading to possible head injury. DO NOT STAND ON ROPE!

Note that due to height limitations, this demonstration is only available in rooms 1410 and 1412.

REFERENCES: (PIRA 1M20.20)

EQUIPMENT: Rope and pulley, as photographed, hanging from support.

SETUP TIME: 5 min.